Look at the workflow
If calls move between reception, sales and support, an extension-based system usually makes routing and visibility easier.
Protect voice quality
Voice traffic needs stable switching, sensible segmentation and enough upstream capacity. Strong internet speed alone does not fix congestion or bad local cabling.
Keep a continuity plan
Document what happens during an internet, power or provider outage and which number customers should still reach.
Project checklist
- List inbound numbers and responsible teams
- Define transfers, queues and business hours
- Test internal and external calls before handover
Practical takeaways
- Define the operating requirement before choosing products
- Document interfaces, failure behaviour and ownership
- Test the completed system and keep records for support
